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Journal of Chemical Sciences

, 131:117 | Cite as

Designing M-bond (X-M···Y, M = transition metal): σ-hole and radial density distribution

  • Jyothish Joy
  • Eluvathingal D JemmisEmail author
Regular Article
  • 9 Downloads
Part of the following topical collections:
  1. Special Issue on 150 years of the Periodic Table

Abstract

Following the ubiquitous H-bond, there is a growing interest in weak non-covalent interactions involving other elements, viz., the Z-bonds (X-Z···Y, Z = halogens, chalcogens, etc.). Although almost all the main group elements can act as Z bond donors, the search for a similar role for transition metals in X-M···Y, (M = transition metal) interaction, called the Metal-bond, is still in its infancy. This article summarizes our attempts to understand the participation of transition metal elements as electron acceptors in a weak interaction with electron-rich species Y. Cambridge Structural Database analysis revealed that except Group 11 and 12 transition metal complexes (Type-II), electron-saturated (18 electron) metal complexes having partly filled d orbitals (Group 3–10; Type-I) hesitate to form Metal-bonds. This is attributed to the partial σ-hole screening by core electron density and diminished stabilization from charge polarization in Type I complexes. We also show that Type-I complexes could be forced to form Metal-bonds by employing extreme ligand conditions, thereby opening new areas of research where Metal-bonds can act as emerging non-covalent interaction in designing supramolecular architectures.

Graphic abstract

Designing Metal-Bond in electron saturated (18 electron) transition metal complexes is a daunting task due to their special electronic structure. Here, we summarize our understanding of the reasons behind this reluctance and provide recipes to make them compactable for Metal-Bond formation.

Keywords

Weak interactions H-Bond M-Bond sigma-hole MESP radial density distribution 

Notes

Acknowledgements

We thank IISc-Bangalore for computational facilities. EDJ thanks the Science and Engineering Research Board, Department of Science and Technology (DST) for the Year of Science Chair Professorship.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Inorganic and Physical ChemistryIndian Institute of ScienceBangaloreIndia
  2. 2.Institute of ChemistryThe Hebrew UniversityJerusalemIsrael

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